[PATCH] D93292: [AArch64][SVE] Add optimization to remove redundant ptest instructions

[Bradley Smith via Phabricator via llvm-commits]

bsmith created this revision.
bsmith added reviewers: paulwalker-arm, joechrisellis, peterwaller-arm.
Herald added subscribers: NickHung, psnobl, hiraditya, kristof.beyls, tschuett.
Herald added a reviewer: efriedma.
bsmith requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

This patch adds a peepholing optimization that removes extra ptest instructions where they are not required, for example:

- ptest of true and another existing condition
- ptest of the same condition twice

Co-Authored-by: Graham Hunter <graham.hunter at arm.com>
Co-Authored-by: Paul Walker <paul.walker at arm.com>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D93292

Files:
  llvm/lib/Target/AArch64/AArch64InstrFormats.td
  llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
  llvm/lib/Target/AArch64/AArch64InstrInfo.h
  llvm/lib/Target/AArch64/SVEInstrFormats.td
  llvm/test/CodeGen/AArch64/sve-ptest-removal-cmpeq.ll
  llvm/test/CodeGen/AArch64/sve-ptest-removal-cmpeq.mir
  llvm/test/CodeGen/AArch64/sve-ptest-removal-cmpge.ll
  llvm/test/CodeGen/AArch64/sve-ptest-removal-cmpgt.ll
  llvm/test/CodeGen/AArch64/sve-ptest-removal-cmphi.ll
  llvm/test/CodeGen/AArch64/sve-ptest-removal-cmphs.ll
  llvm/test/CodeGen/AArch64/sve-ptest-removal-cmple.ll
  llvm/test/CodeGen/AArch64/sve-ptest-removal-cmplo.ll
  llvm/test/CodeGen/AArch64/sve-ptest-removal-cmpls.ll
  llvm/test/CodeGen/AArch64/sve-ptest-removal-cmplt.ll
  llvm/test/CodeGen/AArch64/sve-ptest-removal-cmpne.ll
  llvm/test/CodeGen/AArch64/sve-ptest-removal-whilege.mir
  llvm/test/CodeGen/AArch64/sve-ptest-removal-whilegt.mir
  llvm/test/CodeGen/AArch64/sve-ptest-removal-whilehi.mir
  llvm/test/CodeGen/AArch64/sve-ptest-removal-whilehs.mir
  llvm/test/CodeGen/AArch64/sve-ptest-removal-whilele.mir
  llvm/test/CodeGen/AArch64/sve-ptest-removal-whilelo.mir
  llvm/test/CodeGen/AArch64/sve-ptest-removal-whilels.mir
  llvm/test/CodeGen/AArch64/sve-ptest-removal-whilelt.mir
  llvm/test/CodeGen/AArch64/sve-ptest-removal-whilerw.mir
  llvm/test/CodeGen/AArch64/sve-ptest-removal-whilewr.mir
  llvm/test/CodeGen/AArch64/sve-setcc.ll

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